MUC5AC and hypertrophic cardiomyopathy: OXGR1 is expressed in Glp‐1‐positive enteroendocrine cells (Roberts et al., 2019) and has been variously been implicated in respiratory epithelial mucin production (Bankova et al., 2016), hypertrophic cardiomyopathy (Omede et al., 2016), fibroblast proliferation (Wang et al., 2019), and axon growth but not guidance (Cherif et al., 2018).